4. Steam at 173.46°C and with a specific entropy of 6 kJ/kgK undergoes a polytropic process with n =1.18 until the pressure becomes 2 MPa. What is the final temperature of the steam, the work and heat. 5. Steam at 3.1MPa and with 74.28°C SH rejects 1973.36 KJ/kg of steam heat at constant pressure. Determine the final temperature and the change in specific entropy. 6. A-1 kg steam-water mixture at 1.0 MPa is contained in an inflexible tank. Heat is added until the pressure rises to 3.5 MPa and the temperature to 400°C. Determine the heat added.